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| year | consumption | change |
| 1992 | 4.10 | NA |
| 1993 | 4.50 | 9.76 % |
| 1994 | 5.10 | 13.33 % |
| 1995 | 4.60 | -9.80 % |
| 1996 | 4.70 | 2.17 % |
| 1997 | 4.00 | -14.89 % |
| 1998 | 3.10 | -22.50 % |
| 1999 | 3.00 | -3.23 % |
| 2000 | 2.20 | -26.67 % |
| 2001 | 2.00 | -9.09 % |
| 2002 | 1.40 | -30.00 % |
| 2003 | 1.10 | -21.43 % |
| 2004 | 1.00 | -9.09 % |
| 2005 | 1.30 | 30.00 % |
| 2006 | 1.40 | 7.69 % |
| 2007 | 1.20 | -14.29 % |
| 2008 | 1.50 | 25.00 % |
| 2009 | .90 | -40.00 % |
| 2010 | .50 | -44.44 % |
| 2011 | .70 | 40.00 % |
| 2012 | 1.10 | 57.14 % |
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